/* Reset & base */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
  color: #333;
}
.container {
  max-width: 1200px; margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 20px; padding: 30px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

/* Header */
.header { text-align: center; margin-bottom: 20px; }
.header h1 {
  font-size: 2.2rem; margin-bottom: 6px;
  background: linear-gradient(45deg, #667eea, #764ba2);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.last-updated { color:#555; font-size: 0.95rem; }

/* Controls */
.controls { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0 24px; align-items: center; }
select {
  padding: 12px 16px; min-width: 280px; font-size: 15px;
  border-radius: 10px; border: 2px solid #e1e5e9; background: #fff;
  transition: box-shadow .2s, border-color .2s;
}
select:focus { outline: none; border-color:#667eea; box-shadow:0 0 0 4px rgba(102,126,234,0.15); }
.refresh-btn {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color:#fff; border: none; padding: 12px 18px; border-radius: 10px;
  cursor: pointer; font-size: 15px; display: inline-flex; align-items: center; gap: 8px;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
}
.refresh-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(102,126,234,.35); }
.refresh-btn:disabled { opacity:.7; cursor:not-allowed; }
.btnspinner {
  width: 16px; height: 16px; border: 2px solid #fff; border-top-color: transparent; border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Summary */
.summary {
  background: linear-gradient(135deg, #f6f9fc 0%, #e9f2ff 100%);
  border-left: 5px solid #667eea; border-radius: 14px; padding: 16px; margin-bottom: 20px;
}
.summary h3 { margin-bottom: 12px; }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(150px,1fr)); gap: 12px; }
.summary-item {
  background: #fff; border-radius: 10px; padding: 14px; text-align: center;
  box-shadow: 0 3px 8px rgba(0,0,0,0.06);
}
.summary-item .number { display:block; font-size: 1.7rem; color:#667eea; font-weight: 700; }
.summary-item .label { color:#555; font-size: .9rem; }

/* Table */
.table-container { background: #fff; border-radius: 14px; overflow: hidden; box-shadow: 0 10px 24px rgba(0,0,0,0.08); }
table { width:100%; border-collapse: collapse; }
th {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color:#fff; text-align: left; padding: 16px 14px; font-weight: 600;
}
td { padding: 14px; border-bottom: 1px solid #f0f0f0; vertical-align: top; }
tr:hover { background: #f8f9ff; }
.no-data { text-align: center; padding: 28px; color:#666; font-style: italic; }

/* Badges */
.status-paid, .status-unpaid, .student-badge, .auditor-badge, .mode-online, .mode-direct, .mode-hybrid, .mode-unknown {
  display: inline-block; padding: 4px 10px; border-radius: 16px; font-size: .82rem; color: #fff; white-space: normal; line-height: 1.2;
}
.status-paid { background: #10b981; }
.status-unpaid { background: #ef4444; }
.student-badge { background: #3b82f6; }
.auditor-badge { background: #8b5cf6; }
.mode-online  { background: #06b6d4; }
.mode-direct { background: #f59e0b; }
.mode-hybrid  { background: #7c3aed; }
.mode-unknown { background: #6b7280; }

/* Copy-all button */
.copy-all-wrap {
  display: flex;
  justify-content: flex-end;
  margin: 12px 0 0;
}
.copy-all-btn {
  background: #e5e7eb;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.copy-all-btn:hover { background: #d1d5db; }
.copy-all-btn:active { transform: scale(0.98); background: #cbd5e1; }
@media (max-width: 640px) {
  .copy-all-wrap { justify-content: stretch; }
  .copy-all-btn  { width: 100%; }
}

/* Overlay loader */
.overlay {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.6); backdrop-filter: blur(4px); z-index: 9999;
  transition: opacity .25s ease;
}
.overlay.hidden { opacity: 0; pointer-events: none; }
.loading-box {
  background:#fff; padding: 16px 22px; border-radius: 12px; display:flex; align-items:center; gap:10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
}
.spinner {
  width: 20px; height: 20px; border: 3px solid #ddd; border-top: 3px solid #667eea; border-radius: 50%;
  animation: spin 1s linear infinite;
}
.loading-box span { font-weight: 600; }

/* Animations */
@keyframes spin { to { transform: rotate(360deg);} }

/* --- Mobile-friendly (keep desktop table; enable horizontal scroll) --- */
:root {
  --container-pad: max(20px, env(safe-area-inset-left));
  --container-pad-r: max(20px, env(safe-area-inset-right));
}
@media (max-width: 1024px) {
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  table { min-width: 820px; }
}
@media (max-width: 640px) {
  body { padding-left: var(--container-pad); padding-right: var(--container-pad-r); }
  .controls { flex-direction: column; align-items: stretch; gap: 10px; }
  select, .refresh-btn { width: 100%; font-size: 16px; padding: 12px 14px; }
  .summary-grid { grid-template-columns: 1fr 1fr; }
  th, td { padding: 12px 10px; } /* slightly tighter on phones */
}
@media (max-width: 400px) {
  .summary-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}